Recall 21V648 covers 163 2021-2022 Peterbilt 367, 389, 567, and 579 trucks for brake hose damage. Free repair once available.
Peterbilt is recalling 163 2021-2022 367, 389, 567, and 579 vehicles because the Hill Start Assist valve assembly lacks enough clearance to the rear axle, which can damage the rear brake hose and cut the rear brake signal. That loss can reduce rear braking or remove braking at the rear axle, increasing crash risk; the Peterbilt dealer repair will be free once Peterbilt opens it.
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What's wrong?
The Hill Start Assist valve on the 2021-2022 Peterbilt 367, 389, 567, and 579 is part of the brake system that helps hold the truck briefly when starting on a grade. It is mounted near a crossmember, and it works with the brake lines and fittings that carry the rear brake signal through the system.
On affected trucks, that valve assembly does not have enough clearance from the rear axle when the rear suspension is lowered. The axle can contact or crowd the valve area, damaging the rear brake hose or fittings. When that happens, the rear brake signal can be interrupted, so the rear brakes do not receive the command the system is trying to send.
There is no warning sign before failure. A driver should not count on a light, noise, or pedal change to appear before the hose or fitting is damaged.
Who's affected?
Covers the 367, 389, 567, and 579 across the 2021 and 2022 model years; all share the same hill start assist valve and hydraulic brake hose issue.
| 2022 Peterbilt 389 | hydraulic brake hose |
|---|---|
| 2022 Peterbilt 567 | hydraulic brake hose |
| 2021 Peterbilt 389 | hydraulic brake hose |
| 2021 Peterbilt 567 | hydraulic brake hose |
| 2021 Peterbilt 367 | hydraulic brake hose |
| 2022 Peterbilt 579 | hydraulic brake hose |
| 2021 Peterbilt 579 | hydraulic brake hose |
| 2022 Peterbilt 367 | hydraulic brake hose |
| Units affected | 163 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether this recall applies to your specific truck.
What's the safety risk?
When the rear brake signal is lost, the truck has reduced rear braking capability or no rear-axle braking, increasing crash risk. Schedule the inspection and repair soon, and treat any unusual braking behavior as a reason to stop driving and call a Peterbilt dealer. Repair will be free at any franchised Peterbilt dealer once available.
What should I do?
- Check your VIN to confirm your 2021-2022 Peterbilt 389, 567, 367, or 579 is included in this recall.
- Review Peterbilt's owner letter before arranging the final repair.
- Contact a franchised Peterbilt dealer with recall number 21V648 and ask when the free clearance inspection and assembly re-work is available.
- Describe the rear brake hose concern when you call: the Hill Start Assist valve assembly needs clearance so it does not damage the hose and reduce rear braking.
- Drive cautiously until the repair. Leave extra following distance and avoid hard braking when traffic allows.
What happens at the repair
At the dealer, a Peterbilt technician will inspect clearance around the cross member mounted Hill Start Assist valve assembly and re-work the assembly to match the updated design. Because Peterbilt lists the remedy as under development, the final dealer repair should be treated as not open yet. Once available, the inspection, re-work, parts, and labor will be free under the recall. Peterbilt has a general reimbursement plan on file. If you already paid for a related brake hose or valve assembly repair before the recall notice, ask Peterbilt customer service or the service desk how to submit documentation.
| Reimbursement | Reimbursement available |
|---|
Timeline
| August 19, 2021 | NHTSA published the recall |
|---|---|
| October 18, 2021 | Dealer notification began |
| October 18, 2021 | Dealer notification ended |
| October 18, 2021 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| October 18, 2021 | Interim owner notification (was planned for this date) |
| March 11, 2022 | Owner notification mailed |
Frequently asked questions
What is recall 21V648?
Recall 21V648 covers 163 2021-2022 Peterbilt 367, 389, 567, and 579 trucks with a Hill Start Assist valve assembly that has insufficient clearance to the rear axle. Contact with the rear brake hose can damage the hose and lead to loss of the rear brake signal.
What should I do if my 2021-2022 Peterbilt 367, 389, 567, or 579 is on this recall?
Check your VIN to confirm your specific truck is included in recall 21V648. If it is, contact a franchised Peterbilt dealer and reference recall number 21PBJ. The dealer will inspect the clearance and rework the assembly to the updated design for free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair safety defects at no cost, and PACCAR says Peterbilt dealers will inspect and rework the Hill Start Assist valve assembly free of charge.
What is the safety risk?
The safety risk is reduced rear braking capability or loss of brakes to the rear axle. If the rear brake signal is lost, the truck has less braking force available at the rear axle, increasing crash risk. Confirm the VIN and arrange the free dealer repair.
What if I bought this Peterbilt truck used?
The free recall repair still applies. Recall coverage follows the VIN, not the original owner. Check your VIN to confirm whether your specific 2021-2022 Peterbilt 367, 389, 567, or 579 is included, then call a franchised Peterbilt dealer with recall number 21PBJ.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V648000 |
|---|---|
| Peterbilt customer service | 1-940-591-4220 |
| NHTSA recall # | 21V648 |
| NHTSA recall # (full) | 21V648000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Owner Notification Letter (PDF)
- Download Recall Document (PDF) (PDF)
- Download Recall Document (PDF) (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →